After the death of PC Andrew Harper in the Thames Valley last August, dozens of tributes were left at the scene. One was an epaulette with a piece of blue ribbon, donated by another police officer.
It sparked an idea to collect epaulettes in tribute. Six months on, tens of thousands have been donated from around the world.
Watch Charlotte Briere-Edney's report below:
From police to prison officers, paramedics to community support officers, firefighters, Royal navy police and many many more from every part of the United Kingdom are represented here.
PC Stuart Roberts, Northamptonshire Police:
PC Stuart Robert visited the scene of Andrew Harper's death, placing his epaulette there in tribute. After posting a picture on social media, the idea of creating a collection in honour was born.
Epaulettes have been sent from all over Europe and as far as America, Canada, South Africa, Australia and New Zealand- from officers and whole forces touched by the story of PC Harper's death and compelled to be part of the memorial.
The collection now numbers more than 20,000 and is still growing.
Aaron Childs, Firefighter:
Epaulettes are a very personal symbol for those who work in protective services.
Often completely unique to a particular force or unit, they can bear the names, numbers or ranks of individuals, making them instantly recognisable.
PC Jonathan Prescott, Merseyside Police:
The plan is now to create a huge mural with a local artist charged with the commission.
Where exactly the mural will be displayed hasn't yet been decided, but those involved are keen for it to be public, so all can visit and reflect on the work and sacrifice of those who serve and protect us.